User blog comment:DarkSlayer 3/Theories/@comment-775152-20130625014226

I was actually saddened by the fact that Dante's DT didn't change in DMC4. The most logical explanation is that he now has "full control" over his DT and isn't influenced by the demonic power of his DA's, but it still makes me sad. I like the different forms.

Personally, I endorse the theory that Vergil's mother is Alice from the DMC3 Manga. It makes sense if one buys into the theory that Alice is related to Mary, thus making her also a descendant of the priestess. That way, one can surmise that Arkham brainwashed Alice into seducing one of the Sparda twins, thus providing him with a back-up plan in case Mary died during the events of DMC3 or in case Dante and Vergil killed each other.

This is, of course, all speculation!